Hello everybody,

I recently discovered this video on YouTube and I just can't figure out what could have possibly happened for that helicopter to lose control. It first seems like it slipped to the side somehow, but as you can see in the video, the pilot still manages to take off again. Though for some reason he can't gain altitude and bounces off the ground I think two times before crashing. What do you think happened?
The video is quite graphic and shows the minutes after the crash in a very dramatic way, so please be aware of that.